Year | Value | 2022 | 57.847592678794 | 2021 | 57.608558226036 | 2020 | 57.452916594462 | 2019 | 57.919841663508 | 2018 | 57.803200374933 | 2017 | 57.81467639655 | 2016 | 57.822857494263 | 2015 | 56.146725030113 | 2014 | 57.021333211903 | 2013 | 56.286355063865 | 2012 | 56.418173870294 | 2011 | 55.091497278104 | 2010 | 55.547272891134 | 2009 | 57.583397045899 | 2008 | 56.00000052067 | 2007 | 56.471357557725 | 2006 | 55.588703030089 | 2005 | 59.292765291179 | 2004 | 59.439059247996 | 2003 | 57.889146052349 | 2002 | 57.896045752737 | 2001 | 58.6213578558 | 2000 | 56.239380736034 | 1999 | 57.459121147067 | 1998 | 55.635228684108 | 1997 | 59.401923580684 | 1996 | 59.299707853449 | 1995 | 59.149446299866 | 1994 | 59.329978415339 | 1993 | 59.381848842294 | 1992 | 59.372542190682 | 1991 | 59.434862259569 |
|